F80 Code Requirements 4 — Questions and Answers
Question 1: The NEC requires that receptacles replaced in a location that currently has no grounding means must be replaced with which of the following?
- A two-wire ungrounded receptacle only
- A GFCI-type receptacle labeled 'No Equipment Ground' (Correct answer)
- A three-wire grounded receptacle connected to the grounding bus
- An isolated ground receptacle
Correct answer: A GFCI-type receptacle labeled 'No Equipment Ground'
NEC 406.4(D)(2) permits replacing an ungrounded receptacle with a GFCI receptacle marked 'No Equipment Ground' where no equipment grounding conductor is available.
Question 2: Under NEC Article 410, luminaires installed in a clothes closet must maintain what minimum clearance from a storage area using surface-mounted incandescent fixtures?
- 6 inches
- 12 inches
- 18 inches
- Incandescent fixtures are not permitted in clothes closets (Correct answer)
Correct answer: Incandescent fixtures are not permitted in clothes closets
NEC 410.16(A) prohibits incandescent luminaires with open or partially enclosed lamps in clothes closets due to fire hazard.
Question 3: What is the maximum rating of an overcurrent device permitted to protect a 10 AWG copper conductor used in a branch circuit per the NEC?
- 20 amperes
- 30 amperes (Correct answer)
- 40 amperes
- 60 amperes
Correct answer: 30 amperes
NEC 240.4(D) limits protection for 10 AWG copper conductors to a maximum of 30 amperes.
Question 4: Under the NEC, what is the maximum number of conductors permitted to be connected under a single terminal screw on a receptacle?
- One conductor only, unless the device is listed for more (Correct answer)
- Two conductors if they are the same gauge
- Three conductors if the terminal is rated for it
- No limit as long as the terminal can be tightened
Correct answer: One conductor only, unless the device is listed for more
NEC 110.14(A) requires that no more than one conductor be connected to a single terminal unless the terminal is specifically listed and identified for multiple conductors.
Question 5: According to NEC 210.19(A), branch-circuit conductors must have an ampacity of not less than what percentage of the continuous load plus the non-continuous load?
- 100% of continuous + 100% of non-continuous
- 125% of continuous + 100% of non-continuous (Correct answer)
- 125% of continuous + 125% of non-continuous
- 100% of continuous + 125% of non-continuous
Correct answer: 125% of continuous + 100% of non-continuous
NEC 210.19(A)(1) requires branch-circuit conductors to have an ampacity of not less than 125% of the continuous load plus 100% of the non-continuous load.
Question 6: Per the NEC, when must a disconnecting means be within sight of a motor?
- Always, without exception
- Only for motors over 1 horsepower
- Unless the disconnect can be locked in the open position (Correct answer)
- Only in commercial occupancies
Correct answer: Unless the disconnect can be locked in the open position
NEC 430.102(B) requires the motor disconnecting means to be within sight of the motor, unless the disconnect is lockable in the open position.
Question 7: What is the minimum headroom required in electrical equipment rooms containing 1200-ampere panelboards per NEC 110.26(E)?
- 6 feet
- 6.5 feet (Correct answer)
- 6 feet 3 inches
- The general NEC working space rules apply
Correct answer: 6.5 feet
NEC 110.26(E) requires a minimum headroom of 6.5 feet (2.0 m) for equipment rooms, or the height of the equipment if greater.
F80 Code Requirements 4
The NEC requires that receptacles replaced in a location that currently has no grounding means must be replaced with which of the following?